4. The human
body feels comfortable when the heat stored in the body is

(A) Positive

(B) Negative

(C) Zero

(D) None
of these

Answer: Option C

5. The heat
rejection factor (HRF) is given by

(A) 1 + C.O.P

(B) 1 - C.O.P.

(C) 1 +
(1/C.O.P)

(D) 1 -
(1/C.O.P)

Answer: Option C

6. In order to
collect liquid refrigerant and to prevent it from going to a ________, a device
known as accumulator is used at the suction of compressor.

(A) Compressor

(B) Condenser

(C) Expansion
valve

(D) Evaporator

Answer: Option A

7. The
vertical and uniformly spaced lines on a psychrometric chart indicates

(A) Dry
bulb temperature

(B) Wet
bulb temperature

(C) Dew
point temperature

(D) Specific
humidity

Answer: Option A

8. The
undesirable property of a refrigerant is

(A) Non-toxic

(B) Non-flammable

(C) Non-explosive

(D) High
boiling point

Answer: Option D

9. The
process, generally used in summer air conditioning to cool and dehumidify the
air, is called

(A) Humidification

(B) Dehumidification

(C) Heating
and humidification

(D) Cooling
and dehumidification

Answer: Option D

10. The leakage
in a refrigeration system using ammonia is detected by

(A) Halide
torch

(B) Sulphur
sticks

(C) Soap
and water

(D) All of these

Answer: Option B

11. The
lowest temperature during the cycle in a vapour compression system occurs after

(A) Compression

(B) Expansion

(C) Condensation

(D) Evaporation

Answer: Option D

12. In
a domestic refrigerator, a capillary tube controls the flow of refrigerant from
the

(A) Expansion
valve to the evaporator

(B) Evaporator
to the thermostat

(C) Condenser
to the expansion valve

(D) Condenser
to the evaporator

Answer: Option A

13. The
refrigerant used in small tonnage commercial machines (hermetically sealed
units) is

(A) Ammonia

(B) Carbon
dioxide

(C) Sulphur
dioxide

(D) R-12

Answer: Option C

14. When the air
is passed through an insulated chamber having sprays of water maintained at a
temperature higher than the dew point temperature of entering air but lower
than its dry bulb temperature, then the air is said to be